Device, program, recording medium and method for facilitating management of schedule of voyage

Abstract

In connection with a voyage in which a ship visits several ports on a sailing route, when a user inputs a berthing period at each port on the sailing route on a screen in a computer for managing voyage information displayed by a terminal device, the terminal device specifies, with regard to each sectional sailing route between two neighboring ports on the sailing route, fuel consumption rate when the ship sails on the sectional sailing route based on a sailing speed determined by the input berthing periods and parameters of maritime weather conditions under which the ship sails on the sectional sailing route. The terminal device calculates fuel consumption required for sailing on each sectional sailing route and total fuel consumption required for sailing the entire sailing route using the specified fuel consumption rates.

The invention claimed is: 
     
       1. A system for managing a schedule of a voyage made by a ship sailing on a sailing route from a departure port to a destination port, the ship visiting one or more ports on the sailing route, the system comprising:
 a GPS device configured to measure a current position of the ship; and 
 a processor operatively coupled to the GPS device, the processor configured to: 
 acquire distance data sets indicating a distance between two ports with regard to each set of two consecutive ports on the sailing route; 
 acquire fuel consumption rate data sets each indicating a fuel consumption rate when the ship sails at a certain sailing speed; 
 acquire a current voyage schedule data set indicating a current schedule of the voyage containing a starting time of a time period during which the ship is docked at a berth of each of the one or more ports, an ending time of the time period and an arrival time when the ship arrives at the destination port; 
 calculate a sailing speed at which the ship sails from a port to a subsequent port with regard to each set of two consecutive ports on the sailing route as a current sailing speed, based on the current voyage schedule data set and the distance data sets; 
 calculate a fuel consumption required for the ship to sail from the current position of the ship measured by the GPS device to the destination port as a current fuel consumption, based on the current sailing speed, the distance data sets and the fuel consumption rate data sets; 
 acquire a modified voyage schedule data set indicating a modified schedule of the voyage that is different from the current schedule of the voyage with regard to at least one of the starting times, the ending times and the arrival time; 
 calculate a sailing speed at which the ship sails from a port to a subsequent port with regard to each set of two consecutive ports on the sailing route as a modified sailing speed, based on the modified voyage schedule data set and the distance data sets; 
 calculate a fuel consumption required for the ship to sail from the current position of the ship measured by the GPS device to the destination port as a modified fuel consumption, based on the modified sailing speed, the distance data sets and the fuel consumption rate data sets; 
 compare the current fuel consumption and the modified fuel consumption; and 
 output a data set indicating a result of the comparison. 
 
     
     
       2. The system of  claim 1 , wherein a user selectively adjusts the sailing route based on the data set indicating the result of the comparison.